package examples;/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/**
 * This program will demonstrate the keyboard-interactive authentication.
 * $ CLASSPATH=.:../build javac UserAuthKI.java
 * $ CLASSPATH=.:../build java UserAuthKI
 * If the remote sshd supports keyboard-interactive authentication,
 * you will be prompted.
 */

import com.jcraft.jsch.*;

import java.awt.*;
import javax.swing.*;

public class UserAuthKI {
    public static void main(String[] arg) {

        try {
            JSch jsch = new JSch();

            String host = null;
            if (arg.length > 0) {
                host = arg[0];
            } else {
                host = JOptionPane.showInputDialog("Enter username@hostname",
                        System.getProperty("user.name") +
                                "@localhost");
            }
            String user = host.substring(0, host.indexOf('@'));
            host = host.substring(host.indexOf('@') + 1);

            Session session = jsch.getSession(user, host, 22);

            // username and passphrase will be given via UserInfo interface.
            UserInfo ui = new MyUserInfo();
            session.setUserInfo(ui);
            session.connect();

            Channel channel = session.openChannel("shell");

            channel.setInputStream(System.in);
            channel.setOutputStream(System.out);

            channel.connect();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static class MyUserInfo implements UserInfo, UIKeyboardInteractive {
        @Override
        public String getPassword() {
            return passwd;
        }

        @Override
        public boolean promptYesNo(String str) {
            Object[] options = {"yes", "no"};
            int foo = JOptionPane.showOptionDialog(null,
                    str,
                    "Warning",
                    JOptionPane.DEFAULT_OPTION,
                    JOptionPane.WARNING_MESSAGE,
                    null, options, options[0]);
            return foo == 0;
        }

        String passwd;
        JTextField passwordField = (JTextField) new JPasswordField(20);

        @Override
        public String getPassphrase() {
            return null;
        }

        @Override
        public boolean promptPassphrase(String message) {
            return false;
        }

        @Override
        public boolean promptPassword(String message) {
            Object[] ob = {passwordField};
            int result =
                    JOptionPane.showConfirmDialog(null, ob, message,
                            JOptionPane.OK_CANCEL_OPTION);
            if (result == JOptionPane.OK_OPTION) {
                passwd = passwordField.getText();
                return true;
            } else {
                return false;
            }
        }

        @Override
        public void showMessage(String message) {
            JOptionPane.showMessageDialog(null, message);
        }

        final GridBagConstraints gbc =
                new GridBagConstraints(0, 0, 1, 1, 1, 1,
                        GridBagConstraints.NORTHWEST,
                        GridBagConstraints.NONE,
                        new Insets(0, 0, 0, 0), 0, 0);
        private Container panel;

        @Override
        public String[] promptKeyboardInteractive(String destination,
                                                  String name,
                                                  String instruction,
                                                  String[] prompt,
                                                  boolean[] echo) {
/*
//System.out.println("promptKeyboardInteractive");
System.out.println("destination: "+destination);
System.out.println("name: "+name);
System.out.println("instruction: "+instruction);
System.out.println("prompt.length: "+prompt.length);
System.out.println("prompt: "+prompt[0]);
*/
            panel = new JPanel();
            panel.setLayout(new GridBagLayout());

            gbc.weightx = 1.0;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            gbc.gridx = 0;
            panel.add(new JLabel(instruction), gbc);
            gbc.gridy++;

            gbc.gridwidth = GridBagConstraints.RELATIVE;

            JTextField[] texts = new JTextField[prompt.length];
            for (int i = 0; i < prompt.length; i++) {
                gbc.fill = GridBagConstraints.NONE;
                gbc.gridx = 0;
                gbc.weightx = 1;
                panel.add(new JLabel(prompt[i]), gbc);

                gbc.gridx = 1;
                gbc.fill = GridBagConstraints.HORIZONTAL;
                gbc.weighty = 1;
                if (echo[i]) {
                    texts[i] = new JTextField(20);
                } else {
                    texts[i] = new JPasswordField(20);
                }
                panel.add(texts[i], gbc);
                gbc.gridy++;
            }

            if (JOptionPane.showConfirmDialog(null, panel,
                    destination + ": " + name,
                    JOptionPane.OK_CANCEL_OPTION,
                    JOptionPane.QUESTION_MESSAGE)
                    == JOptionPane.OK_OPTION) {
                String[] response = new String[prompt.length];
                for (int i = 0; i < prompt.length; i++) {
                    response[i] = texts[i].getText();
                }
                return response;
            } else {
                return null;  // cancel
            }
        }
    }
}
